Cushion applied to child safety seat and child safety seat

Abstract

According to the cushion applied to the child safety seat and the child safety seat, the cushion is detachably laid on the child safety seat, the through hole is formed in the middle of the cushion so that a front striding belt can penetrate through the through hole to be connected in a restrained mode, and the seat part is divided into the hip supporting area and the thigh supporting area with the through hole as a reference. At least the thigh supporting area is filled with an energy absorption material with a slow rebound characteristic; under the condition that a vehicle collides or drastically slows down, the action time of elastic compression deformation of a child passenger on the thigh supporting area is effectively prolonged, the thigh supporting area reduces the resultant acceleration and displacement of corresponding parts of the body of the child passenger through a certain counter-acting force, and the real energy absorption effect is achieved; it is ensured that the injury index of the child passenger is optimized, the injury risk of the child passenger is reduced, and the riding safety and reliability of the child passenger are improved; meanwhile, the thigh supporting area is filled with the energy absorption material with the slow rebound characteristic, and the comfort of the child passengers is further improved.

Description

Technical Field

[0001] The utility model relates to children's products, in particular to a seat cushion used for a child safety seat and a child safety seat. Background Art

[0002] At present, the latest international child safety seat regulatory standard is ECE R129, which redefines the division of child restraint system mass groups, adopts the definition of child height combined with the maximum allowable mass instead of a single mass group, and requires that infants under 15 months old must ride in reverse, while the old standard was 9 months old. The provisions of ECE R129 further strengthen the safety of child occupant restraint systems including child safety seats, that is, requiring that child occupant restraint systems should meet its regulations and limit the index values ​​of the child's head 3ms synthetic acceleration, chest 3ms synthetic acceleration, abdominal pressure, head horizontal maximum displacement, and head vertical maximum displacement in the event of a vehicle collision or sudden deceleration, so as to reduce the risk of child occupants being injured by collision.

[0003] ECE R129 stipulates that there are three injury indicators for rearward collision of Q0 dummies of young age (3ms synthetic acceleration of the head, 3ms synthetic acceleration of the chest, and the index value of the maximum vertical displacement of the head). Among them, the control of the internal seating space setting of the child safety seat is the most difficult and the 3ms synthetic acceleration of the chest is the most sensitive. It is difficult to obtain a good safety margin of the 3ms synthetic acceleration of the chest. ECE R129 stipulates that the three injury indicators for rearward collision of Q0 dummies are: 1. The 3ms synthetic acceleration of the head should be limited to 75g; 2. The 3ms synthetic acceleration of the chest should be limited to 55g; 3. The injury indicator of the maximum vertical displacement of the head is limited to 800mm.

[0004] For existing child safety seats, generally, evenly distributed sponge cloth covers are provided on the seat surface and the backrest. In order to improve the comfort of use, the sponge cloth covers provided on the seat surface and the back are also filled with energy-absorbing materials, especially the transition connection area between the back and the seat is filled with energy-absorbing materials to protect the waist. The energy-absorbing material is usually ordinary sponge. For the headrest on the upper part of the backrest, PU foam is generally used for filling. Since ordinary sponge responds to elastic deformation very quickly, its energy absorption effect is poor when the vehicle collides or decelerates sharply. At the same time, the headrest filled with PU foam is heavy. When the child safety seat is subjected to a forward impact, the headrest filled with PU foam will fall off the child safety seat and dive forward with the child's head, thereby accelerating the forward movement kinetic energy of the child occupant. Further research found that the energy absorption effect of the seat filled with ordinary sponge is poor. When the child occupant is subjected to a forward impact, the energy absorption of the legs obviously affects the forward movement posture of the child occupant. Further research found that the front straddle of the five-point safety belt that restrains the child occupant is a soft belt-like structure. When the child occupant is subjected to a forward impact, the front straddle of the crotch of the child occupant will produce a large forward bending elastic deformation. For child occupants with a Q0, there is a hidden danger in the safety margin of the 3ms synthetic acceleration of the chest in such an internal riding space to protect the chest.

[0005] The utility model is proposed to address the problem of insufficient protection in the prior art and the above-mentioned standard research and development. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a seat cushion and a child safety seat for use in a child safety seat. A through hole is set in the middle of the seat cushion for the front crotch belt to pass through for constraint connection, and the seat part is divided into a buttocks support area and a thigh support area with the through hole as a reference, and at least the thigh support area is filled with energy-absorbing material with slow rebound characteristics. Therefore, in the event of a vehicle collision or sudden deceleration, the action time of the elastic compression deformation of the thigh support area by the child occupant is effectively prolonged, and the thigh support area reduces the synthetic acceleration and displacement of the corresponding parts of the child occupant's body through a certain reaction force, thereby achieving a real energy absorption effect, ensuring that the injury index of the child occupant is optimized, meeting the relevant provisions of ECER129, reducing the injury risk of the child occupant, and improving the safety and reliability of the child occupant's riding; at the same time, the thigh support area is filled with energy-absorbing material with slow rebound characteristics, further improving the comfort of the child occupant.

[0007] To solve the above technical problems, the utility model provides a seat cushion for a child safety seat, wherein the seat cushion is detachably laid between a seat surface 201 and a backrest 202 of a child safety seat 200 and comprises a back 100 and a seat 101, wherein the seat 101 is connected to the lower end of the back 100, and a through hole 102 is provided in the middle of the seat 101 for a front strap 203 of the child safety seat 200 to pass through, and the seat 101 comprises a thigh support area 103 located in front of the through hole 102 and a hip support area 104 located behind the through hole 102, and at least the thigh support area 103 is filled with an energy-absorbing material with slow rebound characteristics.

[0008] As described above, in a seat cushion for a child safety seat, the front end side edge of the thigh support area 103 is provided with an avoidance notch 114, and a crossbeam 105 is laterally provided on the seat portion 101 and between the through hole 102 and the avoidance notch 114 to press the thigh support area 103 to elastically deform.

[0009] The seat cushion used in the child safety seat as described above further includes a protective cover 207 which is embedded in the through hole 102 or fixedly connected to the inner peripheral edge of the through hole 102 and through which the front strap 203 passes.

[0010] As described above, in a seat cushion used for a child safety seat, the front side wall of the cover 207 is built with a baffle 208 for abutting against the front side wall inside the through hole 102 and then against the cross beam 105. The baffle 208 is configured as follows: when the front span 203 passing through the cover 207 is subjected to a forward impact, the baffle 208 reacts on the front span 203 with its surface to form a forward constraint, thereby reducing the forward elastic bending deformation of the front span 203, thereby providing the child with better forward restraint.

[0011] In the seat cushion used for a child safety seat as described above, the energy-absorbing material with slow rebound characteristics is memory foam.

[0012] In the seat cushion used for a child safety seat as described above, a headrest 107 is provided at the upper end of the back 100 , and a vertically extending restraint belt 108 is connected to the rear side of the headrest 107 . The upper end of the restraint belt 108 is detachably connected to the headrest 204 of the child safety seat 200 .

[0013] In the seat cushion used for a child safety seat as described above, the lower end of the restraint belt 108 extends downward and is connected to the rear side of the back 100 , and the lower end of the restraint belt 108 and the rear side of the back 100 are adjustably connected via a first connecting member 106 so that the headrest 107 can be adjusted up and down relative to the back 100 .

[0014] In the seat cushion used for a child safety seat as described above, the back portion 100 is integrally connected with the hip support area 104 to form a curved wrapping surface 109 for supporting the waist of a child passenger.

[0015] As described above, a seat cushion for a child safety seat has upper side portions 110 connected to both sides of the back 100, and lower side portions 111 connected to both sides of the seat 101. Side holes 112 are formed between the upper side portion 110 and the lower side portion 111 on each side and between the transition connection between the back 100 and the seat 101, for the left crotch strap 205 and the right crotch strap 206 of the child safety seat 200 to pass through.

[0016] As described above, in a seat cushion used for a child safety seat, the upper part of the lower side portion 111 is connected to the lower part of the upper side portion 110, and the lower side portion 111 is detachably connected to the side of the seat 101. The seat cushion is configured such that when the lower side portion 111 is detached relative to the seat 101, the seat cushion can be stretched and spread out.

[0017] In the seat cushion used for a child safety seat as described above, an adjustable second connecting member 115 is provided between the lower side portion 111 and the side edge of the seat portion 101 so that the inclination angle of the back portion 100 relative to the seat portion 101 can be adjusted.

[0018] In the seat cushion for a child safety seat as described above, the rear side of the back 100 and the bottom side of the seat 101 are both formed with convex curved surfaces 113 correspondingly fitted to the inner side of the backrest 202 and the upper surface of the seat 201 of the child safety seat 200.

[0019] As described above, in a seat cushion used for a child safety seat, the upper surface of the thigh support area 103 is configured as follows: extending toward the front end side of the thigh support area 103 with a constant thickness for a preset distance and then gradually becoming thinner and inclined, and the crossbeam 105 is located in the constant thickness area.

[0020] The utility model also provides a child safety seat 200, which is adapted to the seat cushion described above, and includes a seat surface 201, a backrest 202 and a five-point safety restraint system. The backrest 202 is connected to the rear side of the seat surface 201, and a headrest 204 is provided on the upper part of the backrest 202. The five-point safety restraint system includes a front strap 203, and the front strap 203 passes through a sheath 207 that is embedded in or fixedly connected to the through hole 102 for connection and use; a third connecting piece 209 for detachable connection to the upper end of the restraint belt 108 is provided on the headrest 204, so as to keep the headrest 107 restrained on the child safety seat 200.

[0021] Compared with the prior art, the seat cushion, child safety seat and method for reducing the risk of injury to child passengers of the utility model have the following advantages:

[0022] 1. By filling the thigh support area with energy-absorbing materials with slow rebound characteristics, the elastic compression deformation time of the thigh support area for child passengers is effectively prolonged in the event of a vehicle collision or sudden deceleration. The thigh support area reduces the synthetic acceleration and displacement of the corresponding parts of the child passenger's body through a certain reaction force, achieving a true energy absorption effect, ensuring that the injury index of the child passenger is optimized, meeting the relevant provisions of ECE R129, reducing the injury risk of child passengers, and improving the safety and reliability of child passengers' riding; at the same time, the thigh support area is filled with energy-absorbing materials with slow rebound characteristics, further improving the comfort of child passengers.

[0023] 2. By setting a crossbeam between the through hole and the avoidance gap, the impact force and inertia force of the child occupant act on the crossbeam through the front span belt, and the crossbeam is filled with slow-rebound energy-absorbing material in the thigh support area to absorb energy and buffer the energy, thereby further extending the action time of compressive elastic deformation caused by the front span belt and the crossbeam acting on the thigh support area.

[0024] 3. When the vehicle collides or decelerates sharply, the child occupant is restrained forward by the baffle built into the front side of the sheath acting on the crossbeam with its surface, and the baffle reacts with its surface to the front span belt, thereby reducing the forward elastic bending deformation of the front span belt, thereby subjecting the child occupant to better forward restraint. The force received is transmitted through the crossbeam to the thigh support area filled with energy-absorbing material with slow rebound characteristics, causing it to produce corresponding compressive elastic deformation, ensuring that the action time of the compressive elastic deformation of the thigh support area is reliably extended, so as to correspondingly reduce the synthetic acceleration and displacement of the corresponding parts of the child occupant's body, so that the injury indicators are effectively controlled.

[0025] 4. The headrest itself has a certain weight and is connected to the connecting piece on the headrest through a restraint belt. When the vehicle collides or decelerates sharply, the headrest can be effectively kept restrained on the headrest to prevent the headrest from falling off and colliding with the child occupant, thereby increasing the risk of injury, further improving the safety of the seat cushion and the child safety seat using the seat cushion; and the lower part of the restraint belt is connected to the rear side of the back through the first connecting piece, so that the user can adjust the height of the headrest relative to the back up and down as needed.

[0026] 5. The upper surface of the thigh support area extends toward the front end side of the thigh support area with a constant thickness for a preset distance and then gradually becomes thinner and inclined, thereby improving the comfort of children riding in the seat and effectively supporting the thighs and calves of child passengers. Since the constant thickness of the thigh support area extends for a certain distance and is filled with energy-absorbing materials with slow rebound characteristics, when the vehicle collides or decelerates sharply, the buttocks of the child passenger tend to leave the buttocks support area, so the force of the child passenger's buttocks on the seat cushion will be reduced, while the force of the child passenger's thighs and calves (especially the thighs) on the thigh support area will increase. Therefore, this structural design can achieve better energy absorption effect and reduce the risk of injury.

[0027] 6. The lower side portion is adjustably connected to the side of the seat portion through a second connecting member. By adjusting the second connecting member, the inclination angle of the back relative to the seat portion can be adjusted to further meet the adjustment needs of the user. The lower side portion and the side of the seat portion are detachably connected so that the seat cushion can be stretched and spread out, which is convenient for the user to clean, dry and store. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0029] Figure 1 This is one of the structural schematic diagrams of the seat cushion in the utility model;

[0030] Figure 2 This is the second structural diagram of the seat cushion in the utility model;

[0031] Figure 3 It is a structural schematic diagram of a child safety seat in the utility model;

[0032] Figure 4 This is a schematic diagram of the structure of the seat cushion in the utility model being laid on a child safety seat;

[0033] Figure 5 for Figure 4 A partial enlarged view of

[0034] Figure 6 This is a schematic diagram of the headrest in the present invention being adjusted downward relative to the back;

[0035] Figure 7 A reference diagram of a child passenger in a use state of a child safety seat having a seat cushion of the utility model;

[0036] Figure 8 It is a schematic diagram of the sheath in the utility model;

[0037] Fig. 9 It is a schematic diagram of the utility model in which the seat cushion is in a stretched and spread state after the lower side portion and the seat portion are disassembled;

[0038] Fig.10 It is a schematic diagram of the protective cover embedded in the through hole of the seat cushion in the utility model;

[0039] Fig.11 This is a schematic diagram of the utility model in which the backrest and the headrest are connected through a restraint belt. DETAILED DESCRIPTION

[0040] The implementation modes of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0041] The present invention has repeatedly designed and optimized the internal seating space of a child safety seat with a five-point safety belt restraint system, which is particularly suitable for the internal seating space of children under the age of Q0. It requires an additional energy-absorbing seat cushion that can be detached and used to fill the seat space of the existing child safety seat. To this end, a better sitting posture and a good safety injury index are achieved, and the riding comfort is improved. Therefore, the present invention has found that the width of the seat cushion, the height of the cushion and the shape of the cushion, as well as the structural form of the seat cushion and the energy-absorbing filler inside the seat cushion are all correlated with the size of the injury index.

[0042] The present invention optimizes the shape and structure of the seat cushion, selects appropriate energy-absorbing fillers, and conducts a large number of proofing and actual dynamic collision experiments to obtain a good control of the movement posture of the dummy during the collision process, so that the three injury indicators of the 3ms synthetic acceleration of the head, the 3ms synthetic acceleration of the chest, and the maximum vertical displacement of the head obtained by the movement response of the Q0 dummy during the rearward collision are optimized and meet the requirements of the ECE R129 standard.

[0043] Specifically, Figure 1 , 2As shown in Figures 4, 5 and 6, the utility model discloses a seat cushion for a child safety seat, wherein the seat cushion is detachably laid between a seat surface 201 and a backrest 202 of a child safety seat 200, and comprises a back 100 and a seat 101, wherein the seat 101 is connected to the lower end of the back 100, and a through hole 102 is provided in the middle of the seat 101 for a front strap 203 of the child safety seat 200 to pass through. During normal use, the front strap 203 passes through the circumferentially closed through hole 102, which can limit the seat cushion from sliding relative to the child safety seat, and when a child occupant is restrained to sit on the seat cushion, the possibility of the seat 101 sliding relative to the child safety seat can be better limited due to the weight of the child occupant. The seat 101 includes a thigh support area 103 located in front of the through hole 102 and a hip support area 104 located behind the through hole 102. At least the thigh support area 103 is filled with an energy-absorbing material with slow rebound characteristics, and the hip support area 104 can be filled with ordinary sponge or energy-absorbing material with slow rebound characteristics. Most ordinary sponges are made of polyurethane materials, which have the characteristics of fast compression and elastic recovery. The ordinary sponge used in the utility model is made of polyurethane materials with a density of 16kg / m 3 , surface hardness is 40 degrees.

[0044] The energy-absorbing material with slow rebound characteristics described in the utility model is a memory sponge, which is preferably made of a composite material of polyurethane material and a foaming agent. Compared with ordinary sponges, it is softer and has the characteristics of slower compression and elastic deformation recovery. Specifically, the test parameters of the memory sponge used in the utility model are as follows:

[0045] At an ambient temperature of 23±2℃ and relative humidity ≤55%, after 16 hours, the recovery time of slow rebound measured by ISO 291 is about 7 seconds; the density measured by ISO 845:2006E test method is 98kg / m 3 ; The IFD25% hardness is 130 N / cm measured by ISO-2439 test method 2 ; Using ISO1798:2008 to measure elongation ≥160%; Using ISO1798:2008 to test tensile strength ≥140KPA.

[0046] Therefore, the utility model fills the thigh support area with energy-absorbing material with slow rebound characteristics, which effectively prolongs the action time of the elastic compression deformation of the thigh support area of ​​the child occupant in the event of a vehicle collision or sudden deceleration. The thigh support area reduces the synthetic acceleration and displacement of the corresponding parts of the child occupant's body through a certain reaction force, thereby achieving a real energy absorption effect, ensuring that the injury index of the child occupant is optimized, meeting the relevant provisions of ECE R129, reducing the injury risk of child occupants, and improving the safety and reliability of child occupants' riding; at the same time, the thigh support area is filled with energy-absorbing material with slow rebound characteristics, thereby improving the comfort of the child occupant.

[0047] As for the back 100 , it can also be filled with energy-absorbing materials with slow rebound characteristics, such as memory foam, like the hip support area 104 ; however, in order to reduce manufacturing costs, preferably, the back 100 is filled with ordinary foam.

[0048] Furthermore, if Figure 1 , 4 As shown, the front side edge of the thigh support area 103 is provided with an avoidance notch 114, which can prevent the seat cushion from blocking the relevant control parts of the child safety seat and making it inconvenient to operate. A crossbeam 105 that can press the thigh support area 103 to elastically deform is provided on the seat portion 101 and between the through hole 102 and the avoidance notch 114. The crossbeam 105 is made of high-density memory foam and together with the thigh support area filled with energy-absorbing material with slow rebound characteristics, forms an H-shaped buffer structure with better energy absorption effect. When the child passenger is subjected to impact force and inertia force, the action time of compressive elastic deformation generated by the front cross belt and the crossbeam acting on the thigh support area is further prolonged.

[0049] Furthermore, if Figure 5 , 8 As shown in FIG. 10 , the seat cushion further includes a sheath 207 which is embedded in the through hole 102 or fixedly connected to the inner peripheral edge of the through hole 102 and through which the front cross strap 203 passes. The front side wall of the sheath 207 is built with a baffle 208 which is used to abut against the inner front side wall of the through hole 102 and then abut against the cross beam 105. Figure 5 , 8 As shown, the baffle 208 is arranged in the front side wall of the sheath 207 along the length direction of the sheath and in the center. Its width is slightly smaller than the width of the front span 203. The baffle is made of PE material with a surface hardness of 100 degrees and a thickness of 2mm. Figure 6As shown, when the vehicle collides or decelerates sharply, the child occupant is subjected to forward impact, and the front span belt acts on the crossbeam through the baffle with its surface, and the baffle reacts with its surface to the front span belt 203 to form a forward constraint, thereby reducing the forward elastic deformation of the front span belt 203, thereby making the child occupant subject to better forward constraint. During this process, the crossbeam transfers the force it receives to the thigh support area filled with energy-absorbing material with slow rebound characteristics, causing it to produce corresponding compressive elastic deformation, ensuring that the action time of the compressive elastic deformation on the thigh support area is reliably extended, so as to correspondingly reduce the synthetic acceleration and displacement of the corresponding parts of the child occupant's body, so that the injury index is effectively controlled. Therefore, by adding a baffle to strengthen the front span belt, the situation in which the conventional front span belt is easily bent and elastically deformed forward is avoided, thereby reducing the forward impact displacement of the child occupant and maintaining a good forward movement posture, and finally significantly reducing the 3ms synthetic acceleration value of the chest.

[0050] like Figure 2 As shown, the upper end of the back 100 is connected to a headrest 107, which is filled with PU foam and / or slow-rebound memory foam. Preferably, the headrest 107 is filled with slow-rebound memory foam; the headrest 107 is in a T-shaped structure, and the rear side of the headrest 107 is connected to a vertically extending restraint belt 108, the upper end of which is detachably connected to the hanging point of the rigid part of the headrest 204 of the child safety seat 200 through a ring fastener, and the lower end of the restraint belt 108 extends downward and is connected to the rear side of the back 100. Since the headrest itself has a certain weight, it is connected to the third connecting member 209 on the headrest through the restraint belt. When the vehicle collides or decelerates sharply, the headrest can be effectively kept restrained on the headrest to prevent the headrest from falling off and colliding with the child occupant, thereby increasing the risk of injury. For this reason, this design further improves the safety of the seat cushion and the child safety seat using the seat cushion.

[0051] like Fig. 9 As shown, the lower end of the restraint belt 108 extends downward and is connected to the back side of the back 100. The lower end of the restraint belt 108 and the back side of the back 100 are adjustably connected through the first connecting member 106 so that the headrest 107 can be adjusted up and down relative to the back 100. The first connecting member 106 can be a plurality of buttons arranged between the restraint belt 108 and the back 100, which is not only convenient for disassembly, but also allows the user to adjust the headrest 107 according to different buckle methods and as needed, such as Figure 2 , Figure 6 , Fig.11 As shown, the height of the headrest relative to the back can be adjusted up and down.

[0052] like Figure 1 , 2As shown, the back 100 is connected to upper side portions 110 on both sides, and the seat 101 is connected to lower side portions 111 on both sides. A side hole 112 for the left crotch strap 205 and the right crotch strap 206 of the child safety seat 200 to pass through is formed between the upper side portion 110 and the lower side portion 111 on each side and between the transition connection between the back 100 and the seat 101, and an effective, safe and ample internal seating space is formed between the inner side of the back, the upper surface of the seat, the inner side of the upper side portion and the inner side of the lower side portion. A curved wrapping surface 109 for supporting the waist of a child passenger is formed at the transition connection between the back 100 and the seat 101 and in the internal seating space. The curved wrapping surface 109 is preferably filled with high-resilience energy-absorbing sponge so that when the child passenger is subjected to a forward impact, the impact energy on the waist is well absorbed, thereby changing the forward kinematic posture of the child passenger. Moreover, the curved wrapping surface 109 adopts the ergonomic design concept and has a larger arc surface to support the waist of younger child passengers, compensate for the weak waist of younger child passengers, and relieve waist fatigue caused by long-term riding, thereby improving riding comfort and safety.

[0053] like Fig. 9 As shown, the upper part of the lower side portion 111 is connected to the lower part of the upper side portion 110, and the lower side portion 111 is detachably connected to the side of the seat 101. The seat cushion is configured such that when the lower side portion 111 is detached from the seat 101, the seat cushion can be stretched and spread out, so that it is convenient for the user to clean, dry and store. Furthermore, an adjustable second connecting member 115 is provided between the lower side portion 111 and the side of the seat 101 so that the inclination angle of the back 100 relative to the seat 101 can be adjusted. The second connecting member 115 can be a plurality of button buckles provided between the lower side portion 111 and the side of the seat 101. The adjustment function is realized through different buckles, thereby adjusting the inclination angle of the back relative to the seat, so as to adjust the internal seating space to form an effective, safe and redundant space, so as to further meet the adjustment needs of the user.

[0054] like Figure 2 As shown, the back side of the back 100 and the bottom side of the seat 101 are both convexly formed with a convex curved surface 113 corresponding to the inner side of the backrest 202 and the upper surface of the seat surface 201 of the child safety seat 200. When the child passenger is sitting normally, the seat mainly bears the force of the child passenger's buttocks, that is, the buttocks support area is the main force, while the thigh support area is relatively small. At this time, the static friction between the child safety seat 200 and the seat cushion is relatively large, which can prevent the seat cushion from sliding relative to the seat surface 201 of the child safety seat 200. A through hole is set in the middle of the seat cushion for the cross belt of the five-point safety belt restraint system to pass through and connect and restrain, further preventing the seat cushion from sliding and detaching relative to the seat surface 201 of the child safety seat 200, so that it can maintain a good use state.

[0055] Further, the upper surface of the thigh support area 103 is configured to extend toward the front end side of the thigh support area 103 with a constant thickness for a preset distance and then gradually become thinner and inclined. The preset distance allows the calf of the child passenger to be supported. The design structure is adopted to provide comfort for the child and effectively support the thigh and calf of the child. As can be seen from the above analysis, when the child passenger is sitting normally, the seat is mainly subjected to the force of the child passenger's buttocks, that is, the buttocks support area is the main force, while the thigh support area is relatively less. On the contrary, when the vehicle collides or decelerates sharply, the buttocks of the child passenger tend to be separated from the buttocks support area, so the force of the child passenger's buttocks on the seat cushion will be reduced, while the force of the child passenger's thigh and calf, especially the thigh, on the thigh support area will increase. Since the thigh support area has a preset distance with a constant thickness and is filled with energy-absorbing materials with slow rebound characteristics, the structural design can achieve a better energy absorption effect and reduce the risk of injury, so that the child passenger is better restrained forward.

[0056] like Figure 3-5 As shown, the child safety seat 200 in the present invention is adapted to the seat cushion of the present invention, including a seat surface 201, a backrest 202 and a five-point safety restraint system. The backrest 202 is connected to the rear side of the seat surface 201, and a headrest 204 is provided on the upper part of the backrest 202. The five-point safety restraint system includes a front cross belt 203, and the front cross belt 203 passes through the sheath 207 on the through hole 102 for connection and use; the headrest 204 is provided with a third connecting member 209 for detachable connection with the upper end of the restraint belt 108, so that the headrest 107 can be kept restrained on the child safety seat 200. Specifically, the upper end of the restraint belt 108 has a ring fastener, and the corresponding third connecting member 209 is a hard plastic member that is stably hung and rigidly connected to the headrest 204 and adapted to the ring fastener. Since the headrest itself has a certain weight, it can effectively keep the headrest restrained on the headrest when the vehicle collides or decelerates sharply, preventing the headrest from falling off and colliding with the child occupant, thereby increasing the risk of injury. For this reason, this design further improves the safety and reliability of the connection between the seat cushion and the child safety seat.

[0057] In order to reduce the risk of injury to child passengers, the utility model lays the above-mentioned cushion on the child safety seat 200. When the vehicle collides or decelerates sharply, it is gradually strengthened mainly in the following three aspects:

[0058] 1. The thigh support area 103 is filled with energy-absorbing material with slow rebound characteristics to prolong the time for the child occupant to produce compressive elastic deformation on the thigh support area 103, thereby reducing the synthetic acceleration and displacement of the corresponding parts of the child occupant's body. Specifically, the 3ms synthetic acceleration of the head is limited to 75g; the 3ms synthetic acceleration of the chest is limited to 55g; the injury index of the maximum vertical displacement of the head is limited to 800mm.

[0059] 2. By arranging the crossbeam 105 transversely between the through hole 102 and the avoidance gap 114, the time for the front side of the front crotch belt 203 to generate compressive elastic deformation facing the thigh supporting area 103 filled with energy-absorbing material with slow rebound characteristics is prolonged.

[0060] 3. By building a baffle 208 into the front side of the sheath 207, the front span belt 203 passes through the sheath 207. When the vehicle collides or decelerates sharply, the child occupant is subjected to a forward impact, and the baffle 208 reacts with its surface to the front span belt 203 to form a forward constraint, thereby reducing the forward elastic deformation of the front span belt 203, thereby subjecting the child occupant to better forward restraint. In this process, the baffle 208 acts on the crossbeam with its surface, and the crossbeam also acts on the thigh support area 103 filled with energy-absorbing material with slow rebound characteristics. Therefore, the baffle 208 reinforces the front span belt to avoid the conventional front span belt from being easily bent and elastically deformed forward, thereby reducing the forward impact displacement of the child occupant and maintaining a good forward movement posture, ultimately significantly reducing the 3ms synthetic acceleration value of the chest.

Claims

1. A seat cushion for a child safety seat, the seat cushion being detachably laid between a seat surface (201) and a backrest (202) of the child safety seat (200), characterized in that The invention comprises a back portion (100) and a seat portion (101), wherein the seat portion (101) is connected to the lower end of the back portion (100), and a through hole (102) is provided in the middle of the seat portion (101) for a front strap (203) of a child safety seat (200) to pass through, and the seat portion (101) comprises a thigh support area (103) located in front of the through hole (102) and a hip support area (104) located in the rear of the through hole (102), and at least the thigh support area (103) is filled with an energy-absorbing material having a slow rebound characteristic.

2. A seat cushion for a child safety seat according to claim 1, characterized in that The front end side edge of the thigh support area (103) is provided with an avoidance notch (114), and a crossbeam (105) capable of pressing the thigh support area (103) to elastically deform is laterally provided on the seat (101) and between the through hole (102) and the avoidance notch (114).

3. A seat cushion for a child safety seat according to claim 2, characterized in that It also includes a protective sleeve (207) which is embedded in the through hole (102) or fixedly connected to the inner peripheral edge of the through hole (102) and is used for the front span belt (203) to pass through.

4. A seat cushion for a child safety seat according to claim 3, characterized in that The front side wall of the protective cover (207) is built with a baffle (208) for abutting against the inner front side wall of the through hole (102) and then abutting against the cross beam (105). The baffle (208) is configured such that when the front span belt (203) passing through the protective cover (207) is subjected to a forward impact by a child passenger, the baffle (208) reacts with its surface to the front span belt (203) to form a forward constraint, thereby reducing the forward elastic bending deformation of the front span belt (203), thereby providing the child passenger with a better forward constraint.

5. A seat cushion for a child safety seat according to claim 1, characterized in that The energy absorbing material with slow rebound characteristics is memory foam.

6. A seat cushion for a child safety seat according to claim 1, characterized in that A headrest (107) is provided at the upper end of the back (100), and a vertically extending restraint belt (108) is connected to the rear side of the headrest (107), and the upper end of the restraint belt (108) is detachably connected to the headrest (204) of the child safety seat (200).

7. A seat cushion for a child safety seat according to claim 6, characterized in that The lower end of the restraint belt (108) extends downwardly and is connected to the rear side of the back (100); the lower end of the restraint belt (108) and the rear side of the back (100) are adjustably connected via a first connecting member (106) so that the headrest (107) can be adjusted up and down relative to the back (100).

8. A seat cushion for a child safety seat according to claim 1, characterized in that The back portion (100) and the hip support area (104) are integrally formed and connected to form a curved wrapping surface (109) for supporting the waist of a child passenger.

9. A seat cushion for a child safety seat according to claim 1, characterized in that The back portion (100) is connected to upper side portions (110) on both sides, and the seat portion (101) is connected to lower side portions (111) on both sides. A side hole (112) is formed between the upper side portion (110) and the lower side portion (111) on each side and between the transition connection between the back portion (100) and the seat portion (101) for passing a left crotch strap (205) and a right crotch strap (206) of the child safety seat (200).

10. A seat cushion for a child safety seat according to claim 9, characterized in that The upper portion of the lower side portion (111) is connected to the lower portion of the upper side portion (110), and the lower side portion (111) is detachably connected to the side edge of the seat portion (101), and the seat cushion is configured such that when the lower side portion (111) is detached relative to the seat portion (101), the seat cushion can be stretched and spread out.

11. A seat cushion for a child safety seat according to claim 10, characterized in that An adjustable second connecting member (115) is provided between the lower side portion (111) and the side edge of the seat portion (101) so that the inclination angle of the back portion (100) relative to the seat portion (101) can be adjusted.

12. A seat cushion for a child safety seat according to claim 1, characterized in that The rear side surface of the back portion (100) and the bottom side surface of the seat portion (101) are both formed with convex curved surfaces (113) that are correspondingly fitted to the inner side surface of the backrest (202) and the upper surface of the seat surface (201) of the child safety seat (200).

13. A seat cushion for a child safety seat according to claim 2, characterized in that The upper surface of the thigh support area (103) is configured to extend toward the front end side of the thigh support area (103) with a constant thickness for a preset distance and then gradually become thinner and inclined, and the crossbeam (105) is located in the constant thickness area.

14. A child safety seat (200), characterized in that A seat cushion adapted for use with any one of claims 1 to 13, comprising a seat surface (201), a backrest (202) and a five-point safety restraint system, wherein the backrest (202) is connected to the rear side of the seat surface (201), a headrest (204) is provided on the upper portion of the backrest (202), and the five-point safety restraint system comprises a front cross-belt (203), wherein the front cross-belt (203) passes through a sheath (207) that is embedded in or fixedly connected to a through hole (102) for connection and use; a third connecting piece (209) is provided on the headrest (204) for detachably connecting the upper end of the restraint belt (108) so as to keep the headrest (107) restrained on the child safety seat (200).

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